- United States Patent and Trademark Office
Access to issued patents' full-text (since 1976) and full-page image (since 1790) databases.
- Covers prescription drug products, over-the-counter drugs and discontinued drugs. Search by active ingredient, brand name, owner and patent number.
- U.S. Patent Classification (USPC) System used by the USPTO to classify patent documents. Contains 450 classes and 150,000 subclasses.
- NEW Cooperative Patent Classification (CPC) The US and European Patent organizations have agreed to migrate towards a common classification scheme.